Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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Which packing rings in a centrifugal or reciprocating pump typically show the most wear?

  1. The rings nearest the casing

  2. The rings closest to the motor

  3. The rings nearest the gland

  4. The last two rings installed

The correct answer is: The rings nearest the gland

In centrifugal or reciprocating pumps, the packing rings that are nearest the gland typically experience the most wear. The gland serves to compress the packing rings against the shaft, which creates a seal to prevent leakage. As the pump operates, friction between the shaft and the packing rings generates heat, leading to thermal degradation and physical wear of the material. The rings positioned closest to the gland are subjected to the greatest amount of pressure and friction, as they bear the brunt of the sealing force. This results in a higher rate of degradation over time compared to the other packing rings located further away from the gland. While all packing rings can wear, the proximity to the gland and the associated mechanical stresses make these rings the most susceptible to wear and tear. Understanding this concept is critical for maintenance and troubleshooting in pump operations, as monitoring and replacing these packing rings can enhance the efficiency and lifespan of the pump system.

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